20805583056 has 40 divisors (see below), whose sum is σ = 54269592000. Its totient is φ = 6867860736.

The previous prime is 20805583037. The next prime is 20805583121. The reversal of 20805583056 is 65038550802.

It is a super-2 number, since 2×20805583056² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20805582999 and 20805583017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2099181 + ... + 2109068.

It is an arithmetic number, because the mean of its divisors is an integer number (1356739800).

Almost surely, 2^20805583056 is an apocalyptic number.

It is an amenable number.

20805583056 is an abundant number, since it is smaller than the sum of its proper divisors (33464008944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20805583056 is a wasteful number, since it uses less digits than its factorization.

20805583056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208363 (or 4208357 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 20805583056 in words is "twenty billion, eight hundred five million, five hundred eighty-three thousand, fifty-six".